Oil pump for internal-combustion engines



7 May 6, 1930. J. c. COULOMBE OIL PUMP FOR INTERNAL COMBUSTION ENGINES Filed Oct. 6, 1926 I N VEN TOR.

FIG- 2 Patented 6, 1930 JOSEPH O. CGULOMBE, F KOKOMO, INDIANA.

OIL'LPUMP FOR INTERNAL-COMBUSEEION ENGINES Application flied October 6, 1926. Serial No. 1.393%.

Fig. 4 is a sectional view through line g The rotor 1 is eccentrically disposed in pump body 2 and has a shaft 3 extending into bearing 4 of the pump. The blades 5 rotate in the pum body and are driven by the rotor in whic they reciprocate.

il intake port 6 terminates in a series of holes 7.

Air intake port 8 terminates in the pump body in a crescent-shaped slot 9.

Slots 13, in the rotor behind the blades 5, connect the slot 9 to the pump.

The outlet port 14 terminates in the saw slot 15.

Near the extremity of rotor shaft 3 is an annular groove 10 which collects the surplus oil from the shaft bearing. From the groove 10 to its extremity the shaft diameter is reduced to form a thin annular space 11, to al low admission of air to air port 8, together with the oil collected in the groove 10.

An air line 12 is connected to air port 8 and may be extended to any chamber that it is desired toevacuate of air.

My prior patents No. 1,424,? 15, issued Aug. -1 1922, and No. 1,408,801, issued Mar.7,l922, show oil pumps in which air is added to the circulating oil. In these patents the proportion of air and oil pumped is governed by metering the ports and the flow of air to the pumps 1s continuous. Whereas in the present application the flow of air to the pump is intermittent and the timing of this intermittent action assists in proportioning the air and oil'pumped. I

The intermittent flow of air. to the pump is obtained by the slide-valve action of the rotor 1 over the slot 9, through connecting slot 13.. The length of slot 9 and its relative location to oil intake 7 will vary the roportion of air and oil pumped. Instead 0t allowing the oil port 6 to breakthrough into the pump bore, it is sometimes preferable to use a number of holes placed in a line parallel with the pump bore, in order to allow for a longer slot 9. Due to inertiaythe slot 9 may. be arranged to slightly overlap the opening of oil intake 7 to advantage.

The operation is as follows:

After each blade passes dead center, air will be drawn into the pump from annular space 11 and airline 12, throughports 8 and slots 9 and 13, until slot 9 is closed by slot 13 passing beyond its extremity. After the closing of slot 9, or shortly before, the blade 5 will pass the oil holes 7 allowing oil to be I drawn into the the intake cycle.

I claim:

1. A rotary pump having two inlets, means for continuously creating a suction through one inlet and means for creating a suction at intervals through the other inlet, the suction from the second inlet being segregated from pump for the remainder of ,that of the first.

2. A rotary pump having two segregated inlets and a common outlet, rotating means for closing one of said inlets at equal intervals and continuously drawing from the other of said inlets.

I JOSEPH C. COULOMBE. 

